[RFC PATCH v4 3/3] erofs-utils: introduce compressed fragments support

zbestahu at gmail.com zbestahu at gmail.com
Sun Aug 21 23:57:25 AEST 2022


From: Yue Hu <huyue2 at coolpad.com>

This approach can merge tail pclusters or the whole files into a special
inode in order to achieve greater compression ratio. And an option of
pcluster size is provided for different compression requirments.

Meanwhile, we change to write the uncompressed data from 'clusterofs'
when compressing files since it can benefit from in-place I/O. For now,
this change goes with the fragments.

Signed-off-by: Yue Hu <huyue2 at coolpad.com>
---
 include/erofs/compress.h  |   3 +-
 include/erofs/config.h    |   3 +-
 include/erofs/fragments.h |  25 +++++++++
 include/erofs/inode.h     |   1 +
 include/erofs/internal.h  |   1 +
 include/erofs_fs.h        |   1 +
 lib/Makefile.am           |   4 +-
 lib/compress.c            | 108 ++++++++++++++++++++++++++++----------
 lib/fragments.c           |  58 ++++++++++++++++++++
 lib/inode.c               |  59 ++++++++++++++++-----
 mkfs/main.c               |  64 +++++++++++++++++++---
 11 files changed, 277 insertions(+), 50 deletions(-)
 create mode 100644 include/erofs/fragments.h
 create mode 100644 lib/fragments.c

diff --git a/include/erofs/compress.h b/include/erofs/compress.h
index 24f6204..d17aadb 100644
--- a/include/erofs/compress.h
+++ b/include/erofs/compress.h
@@ -18,7 +18,8 @@ extern "C"
 #define EROFS_CONFIG_COMPR_MIN_SZ           (32   * 1024)
 
 void z_erofs_drop_inline_pcluster(struct erofs_inode *inode);
-int erofs_write_compressed_file(struct erofs_inode *inode);
+int erofs_write_compressed_file_from_fd(struct erofs_inode *inode, int fd,
+					bool is_src);
 
 int z_erofs_compress_init(struct erofs_buffer_head *bh);
 int z_erofs_compress_exit(void);
diff --git a/include/erofs/config.h b/include/erofs/config.h
index 539d813..764b0f7 100644
--- a/include/erofs/config.h
+++ b/include/erofs/config.h
@@ -44,6 +44,7 @@ struct erofs_configure {
 	char c_chunkbits;
 	bool c_noinline_data;
 	bool c_ztailpacking;
+	bool c_fragments;
 	bool c_ignore_mtime;
 	bool c_showprogress;
 
@@ -62,7 +63,7 @@ struct erofs_configure {
 	/* < 0, xattr disabled and INT_MAX, always use inline xattrs */
 	int c_inline_xattr_tolerance;
 
-	u32 c_pclusterblks_max, c_pclusterblks_def;
+	u32 c_pclusterblks_max, c_pclusterblks_def, c_pclusterblks_packed;
 	u32 c_max_decompressed_extent_bytes;
 	u32 c_dict_size;
 	u64 c_unix_timestamp;
diff --git a/include/erofs/fragments.h b/include/erofs/fragments.h
new file mode 100644
index 0000000..913aa99
--- /dev/null
+++ b/include/erofs/fragments.h
@@ -0,0 +1,25 @@
+/* SPDX-License-Identifier: GPL-2.0+ OR Apache-2.0 */
+/*
+ * Copyright (C), 2022, Coolpad Group Limited.
+ */
+#ifndef __EROFS_FRAGMENTS_H
+#define __EROFS_FRAGMENTS_H
+
+#ifdef __cplusplus
+extern "C"
+{
+#endif
+
+#include "erofs/internal.h"
+
+int z_erofs_pack_fragments(struct erofs_inode *inode, void *data,
+			   unsigned int len);
+struct erofs_inode *erofs_mkfs_build_fragments(void);
+int erofs_fragments_init(void);
+void erofs_fragments_exit(void);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif
diff --git a/include/erofs/inode.h b/include/erofs/inode.h
index 79b8d89..bf20cd3 100644
--- a/include/erofs/inode.h
+++ b/include/erofs/inode.h
@@ -22,6 +22,7 @@ unsigned int erofs_iput(struct erofs_inode *inode);
 erofs_nid_t erofs_lookupnid(struct erofs_inode *inode);
 struct erofs_inode *erofs_mkfs_build_tree_from_path(struct erofs_inode *parent,
 						    const char *path);
+struct erofs_inode *erofs_mkfs_build_special_from_fd(int fd, const char *name);
 
 #ifdef __cplusplus
 }
diff --git a/include/erofs/internal.h b/include/erofs/internal.h
index 58590ed..2e834e5 100644
--- a/include/erofs/internal.h
+++ b/include/erofs/internal.h
@@ -212,6 +212,7 @@ struct erofs_inode {
 	uint64_t capabilities;
 #endif
 	erofs_off_t fragmentoff;
+	unsigned int fragment_size;
 };
 
 static inline bool is_inode_layout_compression(struct erofs_inode *inode)
diff --git a/include/erofs_fs.h b/include/erofs_fs.h
index 2422e1c..997ac0c 100644
--- a/include/erofs_fs.h
+++ b/include/erofs_fs.h
@@ -267,6 +267,7 @@ struct erofs_inode_chunk_index {
 
 /* maximum supported size of a physical compression cluster */
 #define Z_EROFS_PCLUSTER_MAX_SIZE	(1024 * 1024)
+#define Z_EROFS_PCLUSTER_MAX_BLKS	(Z_EROFS_PCLUSTER_MAX_SIZE / EROFS_BLKSIZ)
 
 /* available compression algorithm types (for h_algorithmtype) */
 enum {
diff --git a/lib/Makefile.am b/lib/Makefile.am
index 3fad357..95f1d55 100644
--- a/lib/Makefile.am
+++ b/lib/Makefile.am
@@ -22,12 +22,14 @@ noinst_HEADERS = $(top_srcdir)/include/erofs_fs.h \
       $(top_srcdir)/include/erofs/trace.h \
       $(top_srcdir)/include/erofs/xattr.h \
       $(top_srcdir)/include/erofs/compress_hints.h \
+      $(top_srcdir)/include/erofs/fragments.h \
       $(top_srcdir)/lib/liberofs_private.h
 
 noinst_HEADERS += compressor.h
 liberofs_la_SOURCES = config.c io.c cache.c super.c inode.c xattr.c exclude.c \
 		      namei.c data.c compress.c compressor.c zmap.c decompress.c \
-		      compress_hints.c hashmap.c sha256.c blobchunk.c dir.c
+		      compress_hints.c hashmap.c sha256.c blobchunk.c dir.c \
+		      fragments.c
 liberofs_la_CFLAGS = -Wall -I$(top_srcdir)/include
 if ENABLE_LZ4
 liberofs_la_CFLAGS += ${LZ4_CFLAGS}
diff --git a/lib/compress.c b/lib/compress.c
index fd02053..fde14f6 100644
--- a/lib/compress.c
+++ b/lib/compress.c
@@ -18,6 +18,7 @@
 #include "compressor.h"
 #include "erofs/block_list.h"
 #include "erofs/compress_hints.h"
+#include "erofs/fragments.h"
 
 static struct erofs_compress compresshandle;
 static unsigned int algorithmtype[2];
@@ -74,9 +75,9 @@ static void vle_write_indexes(struct z_erofs_vle_compress_ctx *ctx,
 	if (!d1) {
 		/*
 		 * A lcluster cannot have three parts with the middle one which
-		 * is well-compressed for !ztailpacking cases.
+		 * is well-compressed for !ztailpacking and !fragments cases.
 		 */
-		DBG_BUGON(!raw && !cfg.c_ztailpacking);
+		DBG_BUGON(!raw && !cfg.c_ztailpacking && !cfg.c_fragments);
 		type = raw ? Z_EROFS_VLE_CLUSTER_TYPE_PLAIN :
 			Z_EROFS_VLE_CLUSTER_TYPE_HEAD;
 		advise = cpu_to_le16(type << Z_EROFS_VLE_DI_CLUSTER_TYPE_BIT);
@@ -143,7 +144,7 @@ static int write_uncompressed_extent(struct z_erofs_vle_compress_ctx *ctx,
 				     unsigned int *len, char *dst)
 {
 	int ret;
-	unsigned int count;
+	unsigned int count, offset, rcopied, rzeroed;
 
 	/* reset clusterofs to 0 if permitted */
 	if (!erofs_sb_has_lz4_0padding() && ctx->clusterofs &&
@@ -153,11 +154,21 @@ static int write_uncompressed_extent(struct z_erofs_vle_compress_ctx *ctx,
 		ctx->clusterofs = 0;
 	}
 
-	/* write uncompressed data */
+	/*
+	 * write uncompressed data from clusterofs which can benefit from
+	 * in-place I/O, loop shift right when to exceed EROFS_BLKSIZ.
+	 */
 	count = min(EROFS_BLKSIZ, *len);
 
-	memcpy(dst, ctx->queue + ctx->head, count);
-	memset(dst + count, 0, EROFS_BLKSIZ - count);
+	offset = cfg.c_fragments ? ctx->clusterofs : 0;
+	rcopied = min(EROFS_BLKSIZ - offset, count);
+	rzeroed = EROFS_BLKSIZ - offset - rcopied;
+
+	memcpy(dst + offset, ctx->queue + ctx->head, rcopied);
+	memcpy(dst, ctx->queue + ctx->head + rcopied, count - rcopied);
+
+	memset(dst + offset + rcopied, 0, rzeroed);
+	memset(dst + count - rcopied, 0, EROFS_BLKSIZ - count - rzeroed);
 
 	erofs_dbg("Writing %u uncompressed data to block %u",
 		  count, ctx->blkaddr);
@@ -167,8 +178,11 @@ static int write_uncompressed_extent(struct z_erofs_vle_compress_ctx *ctx,
 	return count;
 }
 
-static unsigned int z_erofs_get_max_pclusterblks(struct erofs_inode *inode)
+static unsigned int z_erofs_get_max_pclusterblks(struct erofs_inode *inode,
+						 bool is_src)
 {
+	if (cfg.c_fragments && !is_src)
+		return cfg.c_pclusterblks_packed;
 #ifndef NDEBUG
 	if (cfg.c_random_pclusterblks)
 		return 1 + rand() % cfg.c_pclusterblks_max;
@@ -224,7 +238,7 @@ static void tryrecompress_trailing(void *in, unsigned int *insize,
 
 static int vle_compress_one(struct erofs_inode *inode,
 			    struct z_erofs_vle_compress_ctx *ctx,
-			    bool final)
+			    bool final, bool is_src)
 {
 	struct erofs_compress *const h = &compresshandle;
 	unsigned int len = ctx->tail - ctx->head;
@@ -234,14 +248,19 @@ static int vle_compress_one(struct erofs_inode *inode,
 	char *const dst = dstbuf + EROFS_BLKSIZ;
 
 	while (len) {
-		unsigned int pclustersize =
-			z_erofs_get_max_pclusterblks(inode) * EROFS_BLKSIZ;
+		unsigned int pclustersize = EROFS_BLKSIZ *
+				z_erofs_get_max_pclusterblks(inode, is_src);
 		bool may_inline = (cfg.c_ztailpacking && final);
+		bool may_packing = (cfg.c_fragments && final && is_src);
 		bool raw;
 
 		if (len <= pclustersize) {
 			if (!final)
 				break;
+			if (may_packing) {
+				count = len;
+				goto frag_packing;
+			}
 			if (!may_inline && len <= EROFS_BLKSIZ)
 				goto nocompression;
 		}
@@ -294,6 +313,19 @@ nocompression:
 				return ret;
 			ctx->compressedblks = 1;
 			raw = false;
+		} else if (may_packing && len == count && ret < pclustersize) {
+frag_packing:
+			ret = z_erofs_pack_fragments(inode,
+						     ctx->queue + ctx->head,
+						     len);
+			if (ret < 0)
+				return ret;
+			if (inode->i_size == inode->fragment_size) {
+				ctx->head += len;
+				return 0;
+			}
+			ctx->compressedblks = 0;
+			raw = false;
 		} else {
 			unsigned int tailused, padding;
 
@@ -546,13 +578,20 @@ static void z_erofs_write_mapheader(struct erofs_inode *inode,
 {
 	struct z_erofs_map_header h = {
 		.h_advise = cpu_to_le16(inode->z_advise),
-		.h_idata_size = cpu_to_le16(inode->idata_size),
 		.h_algorithmtype = inode->z_algorithmtype[1] << 4 |
 				   inode->z_algorithmtype[0],
 		/* lclustersize */
 		.h_clusterbits = inode->z_logical_clusterbits - 12,
 	};
 
+	if (cfg.c_fragments)
+		h.h_fragmentoff = cpu_to_le32(inode->fragmentoff);
+	else
+		h.h_idata_size = cpu_to_le16(inode->idata_size);
+
+	if (inode->fragment_size && inode->i_size == inode->fragment_size)
+		h.h_clusterbits |=  1 << Z_EROFS_FRAGMENT_INODE_BIT;
+
 	memset(compressmeta, 0, Z_EROFS_LEGACY_MAP_HEADER_SIZE);
 	/* write out map header */
 	memcpy(compressmeta, &h, sizeof(struct z_erofs_map_header));
@@ -605,30 +644,25 @@ void z_erofs_drop_inline_pcluster(struct erofs_inode *inode)
 	inode->eof_tailraw = NULL;
 }
 
-int erofs_write_compressed_file(struct erofs_inode *inode)
+int erofs_write_compressed_file_from_fd(struct erofs_inode *inode, int fd,
+					bool is_src)
 {
 	struct erofs_buffer_head *bh;
 	static struct z_erofs_vle_compress_ctx ctx;
 	erofs_off_t remaining;
 	erofs_blk_t blkaddr, compressed_blocks;
 	unsigned int legacymetasize;
-	int ret, fd;
+	int ret;
 	u8 *compressmeta = malloc(vle_compressmeta_capacity(inode->i_size));
 
 	if (!compressmeta)
 		return -ENOMEM;
 
-	fd = open(inode->i_srcpath, O_RDONLY | O_BINARY);
-	if (fd < 0) {
-		ret = -errno;
-		goto err_free_meta;
-	}
-
 	/* allocate main data buffer */
 	bh = erofs_balloc(DATA, 0, 0, 0);
 	if (IS_ERR(bh)) {
 		ret = PTR_ERR(bh);
-		goto err_close;
+		goto err_free_meta;
 	}
 
 	/* initialize per-file compression setting */
@@ -649,6 +683,9 @@ int erofs_write_compressed_file(struct erofs_inode *inode)
 	inode->z_algorithmtype[1] = algorithmtype[1];
 	inode->z_logical_clusterbits = LOG_BLOCK_SIZE;
 
+	inode->idata_size = 0;
+	inode->fragment_size = 0;
+
 	blkaddr = erofs_mapbh(bh->block);	/* start_blkaddr */
 	ctx.blkaddr = blkaddr;
 	ctx.metacur = compressmeta + Z_EROFS_LEGACY_MAP_HEADER_SIZE;
@@ -668,7 +705,7 @@ int erofs_write_compressed_file(struct erofs_inode *inode)
 		remaining -= readcount;
 		ctx.tail += readcount;
 
-		ret = vle_compress_one(inode, &ctx, !remaining);
+		ret = vle_compress_one(inode, &ctx, !remaining, is_src);
 		if (ret)
 			goto err_free_idata;
 	}
@@ -682,19 +719,20 @@ int erofs_write_compressed_file(struct erofs_inode *inode)
 	vle_write_indexes_final(&ctx);
 	legacymetasize = ctx.metacur - compressmeta;
 	/* estimate if data compression saves space or not */
-	if (compressed_blocks * EROFS_BLKSIZ + inode->idata_size +
+	if (!inode->fragment_size &&
+	    compressed_blocks * EROFS_BLKSIZ + inode->idata_size +
 	    legacymetasize >= inode->i_size) {
 		ret = -ENOSPC;
 		goto err_free_idata;
 	}
 	z_erofs_write_mapheader(inode, compressmeta);
 
-	close(fd);
 	if (compressed_blocks) {
 		ret = erofs_bh_balloon(bh, blknr_to_addr(compressed_blocks));
 		DBG_BUGON(ret != EROFS_BLKSIZ);
 	} else {
-		DBG_BUGON(!inode->idata_size);
+		if (!cfg.c_fragments)
+			DBG_BUGON(!inode->idata_size);
 	}
 
 	erofs_info("compressed %s (%llu bytes) into %u blocks",
@@ -717,7 +755,8 @@ int erofs_write_compressed_file(struct erofs_inode *inode)
 		DBG_BUGON(ret);
 	}
 	inode->compressmeta = compressmeta;
-	erofs_droid_blocklist_write(inode, blkaddr, compressed_blocks);
+	if (is_src)
+		erofs_droid_blocklist_write(inode, blkaddr, compressed_blocks);
 	return 0;
 
 err_free_idata:
@@ -727,8 +766,6 @@ err_free_idata:
 	}
 err_bdrop:
 	erofs_bdrop(bh, true);	/* revoke buffer */
-err_close:
-	close(fd);
 err_free_meta:
 	free(compressmeta);
 	return ret;
@@ -834,14 +871,27 @@ int z_erofs_compress_init(struct erofs_buffer_head *sb_bh)
 	 * to be loaded in order to get those compressed block counts.
 	 */
 	if (cfg.c_pclusterblks_max > 1) {
-		if (cfg.c_pclusterblks_max >
-		    Z_EROFS_PCLUSTER_MAX_SIZE / EROFS_BLKSIZ) {
+		if (cfg.c_pclusterblks_max > Z_EROFS_PCLUSTER_MAX_BLKS) {
 			erofs_err("unsupported clusterblks %u (too large)",
 				  cfg.c_pclusterblks_max);
 			return -EINVAL;
 		}
+		if (cfg.c_pclusterblks_packed > Z_EROFS_PCLUSTER_MAX_BLKS) {
+			erofs_err("unsupported clusterblks %u (too large for fragments)",
+				  cfg.c_pclusterblks_packed);
+			return -EINVAL;
+		}
+		if (cfg.c_pclusterblks_packed == 1) {
+			erofs_err("physical cluster size of fragments should > 4096 bytes");
+			return -EINVAL;
+		}
 		erofs_sb_set_big_pcluster();
 	}
+	if (!erofs_sb_has_big_pcluster() && cfg.c_pclusterblks_packed > 1) {
+		erofs_err("invalid clusterblks %u (for fragments)",
+			  cfg.c_pclusterblks_packed);
+		return -EINVAL;
+	}
 
 	if (ret != Z_EROFS_COMPRESSION_LZ4)
 		erofs_sb_set_compr_cfgs();
diff --git a/lib/fragments.c b/lib/fragments.c
new file mode 100644
index 0000000..73c0d1b
--- /dev/null
+++ b/lib/fragments.c
@@ -0,0 +1,58 @@
+// SPDX-License-Identifier: GPL-2.0+ OR Apache-2.0
+/*
+ * Copyright (C), 2022, Coolpad Group Limited.
+ * Created by Yue Hu <huyue2 at coolpad.com>
+ */
+#define _GNU_SOURCE
+#include <stdlib.h>
+#include <unistd.h>
+#include "erofs/err.h"
+#include "erofs/inode.h"
+#include "erofs/compress.h"
+#include "erofs/print.h"
+#include "erofs/fragments.h"
+
+static FILE *packedfile;
+
+int z_erofs_pack_fragments(struct erofs_inode *inode, void *data,
+			   unsigned int len)
+{
+	inode->z_advise |= Z_EROFS_ADVISE_FRAGMENT_PCLUSTER;
+	inode->fragmentoff = ftell(packedfile);
+	inode->fragment_size = len;
+
+	if (write(fileno(packedfile), data, len) < 0)
+		return -EIO;
+
+	erofs_sb_set_fragments();
+
+	erofs_dbg("Recording %u fragment data at %lu", inode->fragment_size,
+		  inode->fragmentoff);
+	return len;
+}
+
+struct erofs_inode *erofs_mkfs_build_fragments(void)
+{
+	fseek(packedfile, 0, SEEK_SET);
+
+	return erofs_mkfs_build_special_from_fd(fileno(packedfile),
+						"packed_file");
+}
+
+void erofs_fragments_exit(void)
+{
+	if (packedfile)
+		fclose(packedfile);
+}
+
+int erofs_fragments_init(void)
+{
+#ifdef HAVE_TMPFILE64
+	packedfile = tmpfile64();
+#else
+	packedfile = tmpfile();
+#endif
+	if (!packedfile)
+		return -ENOMEM;
+	return 0;
+}
diff --git a/lib/inode.c b/lib/inode.c
index 4da28b3..e6f3dfa 100644
--- a/lib/inode.c
+++ b/lib/inode.c
@@ -424,7 +424,11 @@ int erofs_write_file(struct erofs_inode *inode)
 	}
 
 	if (cfg.c_compr_alg_master && erofs_file_is_compressible(inode)) {
-		ret = erofs_write_compressed_file(inode);
+		fd = open(inode->i_srcpath, O_RDONLY | O_BINARY);
+		if (fd < 0)
+			return -errno;
+		ret = erofs_write_compressed_file_from_fd(inode, fd, true);
+		close(fd);
 
 		if (!ret || ret != -ENOSPC)
 			return ret;
@@ -935,6 +939,24 @@ static struct erofs_inode *erofs_new_inode(void)
 	return inode;
 }
 
+static struct erofs_inode *erofs_generate_inode(struct stat64 *st,
+						const char *path)
+{
+	struct erofs_inode *inode;
+	int ret;
+
+	inode = erofs_new_inode();
+	if (IS_ERR(inode))
+		return inode;
+
+	ret = erofs_fill_inode(inode, st, path);
+	if (ret) {
+		free(inode);
+		return ERR_PTR(ret);
+	}
+	return inode;
+}
+
 /* get the inode from the (source) path */
 static struct erofs_inode *erofs_iget_from_path(const char *path, bool is_src)
 {
@@ -962,17 +984,7 @@ static struct erofs_inode *erofs_iget_from_path(const char *path, bool is_src)
 	}
 
 	/* cannot find in the inode cache */
-	inode = erofs_new_inode();
-	if (IS_ERR(inode))
-		return inode;
-
-	ret = erofs_fill_inode(inode, &st, path);
-	if (ret) {
-		free(inode);
-		return ERR_PTR(ret);
-	}
-
-	return inode;
+	return erofs_generate_inode(&st, path);
 }
 
 static void erofs_fixup_meta_blkaddr(struct erofs_inode *rootdir)
@@ -1180,3 +1192,26 @@ struct erofs_inode *erofs_mkfs_build_tree_from_path(struct erofs_inode *parent,
 
 	return erofs_mkfs_build_tree(inode);
 }
+
+struct erofs_inode *erofs_mkfs_build_special_from_fd(int fd, const char *name)
+{
+        struct stat64 st;
+        struct erofs_inode *inode;
+        int ret;
+
+        ret = fstat64(fd, &st);
+        if (ret)
+                return ERR_PTR(-errno);
+
+        inode = erofs_generate_inode(&st, name);
+        if (IS_ERR(inode))
+                return inode;
+
+	/* only for compressed file now */
+        ret = erofs_write_compressed_file_from_fd(inode, fd, false);
+        if (ret)
+                return ERR_PTR(ret);
+
+        erofs_prepare_inode_buffer(inode);
+        return inode;
+}
diff --git a/mkfs/main.c b/mkfs/main.c
index b969b35..cfc2c4a 100644
--- a/mkfs/main.c
+++ b/mkfs/main.c
@@ -23,6 +23,7 @@
 #include "erofs/block_list.h"
 #include "erofs/compress_hints.h"
 #include "erofs/blobchunk.h"
+#include "erofs/fragments.h"
 #include "../lib/liberofs_private.h"
 
 #ifdef HAVE_LIBUUID
@@ -133,9 +134,9 @@ static int parse_extended_opts(const char *opts)
 		const char *p = strchr(token, ',');
 
 		next = NULL;
-		if (p)
+		if (p) {
 			next = p + 1;
-		else {
+		} else {
 			p = token + strlen(token);
 			next = p;
 		}
@@ -202,7 +203,34 @@ static int parse_extended_opts(const char *opts)
 				return -EINVAL;
 			cfg.c_ztailpacking = true;
 		}
+
+		if (MATCH_EXTENTED_OPT("fragments", token, keylen)) {
+			char *endptr;
+			u64 i;
+
+			if (vallen || cfg.c_ztailpacking)
+				return -EINVAL;
+			cfg.c_fragments = true;
+
+			i = strtoull(next, &endptr, 0);
+			if (i == 0 || (*endptr != ',' && *endptr != '\0')) {
+				cfg.c_pclusterblks_packed = 1;
+				continue;
+			}
+			if (i % EROFS_BLKSIZ) {
+				erofs_err("invalid physical clustersize %llu",
+					  i);
+				return -EINVAL;
+			}
+			cfg.c_pclusterblks_packed = i / EROFS_BLKSIZ;
+
+			if (*endptr == ',')
+				next = strchr(next, ',')  + 1;
+			else
+				goto out;
+		}
 	}
+out:
 	return 0;
 }
 
@@ -458,7 +486,8 @@ static int mkfs_parse_options_cfg(int argc, char *argv[])
 
 int erofs_mkfs_update_super_block(struct erofs_buffer_head *bh,
 				  erofs_nid_t root_nid,
-				  erofs_blk_t *blocks)
+				  erofs_blk_t *blocks,
+				  erofs_nid_t packed_nid)
 {
 	struct erofs_super_block sb = {
 		.magic     = cpu_to_le32(EROFS_SUPER_MAGIC_V1),
@@ -482,6 +511,7 @@ int erofs_mkfs_update_super_block(struct erofs_buffer_head *bh,
 	*blocks         = erofs_mapbh(NULL);
 	sb.blocks       = cpu_to_le32(*blocks);
 	sb.root_nid     = cpu_to_le16(root_nid);
+	sb.packed_nid    = cpu_to_le64(packed_nid);
 	memcpy(sb.uuid, sbi.uuid, sizeof(sb.uuid));
 
 	if (erofs_sb_has_compr_cfgs())
@@ -599,8 +629,8 @@ int main(int argc, char **argv)
 {
 	int err = 0;
 	struct erofs_buffer_head *sb_bh;
-	struct erofs_inode *root_inode;
-	erofs_nid_t root_nid;
+	struct erofs_inode *root_inode, *packed_inode;
+	erofs_nid_t root_nid, packed_nid;
 	struct stat64 st;
 	erofs_blk_t nblocks;
 	struct timeval t;
@@ -670,6 +700,14 @@ int main(int argc, char **argv)
 		erofs_warn("EXPERIMENTAL chunked file feature in use. Use at your own risk!");
 	if (cfg.c_ztailpacking)
 		erofs_warn("EXPERIMENTAL compressed inline data feature in use. Use at your own risk!");
+	if (cfg.c_fragments) {
+		err = erofs_fragments_init();
+		if (err) {
+			erofs_err("failed to initialize fragments");
+			return 1;
+		}
+		erofs_warn("EXPERIMENTAL compressed fragments feature in use. Use at your own risk!");
+	}
 	erofs_set_fs_root(cfg.c_src_path);
 #ifndef NDEBUG
 	if (cfg.c_random_pclusterblks)
@@ -739,7 +777,19 @@ int main(int argc, char **argv)
 			goto exit;
 	}
 
-	err = erofs_mkfs_update_super_block(sb_bh, root_nid, &nblocks);
+	packed_nid = 0;
+	if (cfg.c_fragments) {
+		packed_inode = erofs_mkfs_build_fragments();
+		if (IS_ERR(packed_inode)) {
+			err = PTR_ERR(packed_inode);
+			goto exit;
+		}
+		packed_nid = erofs_lookupnid(packed_inode);
+		erofs_iput(packed_inode);
+	}
+
+	err = erofs_mkfs_update_super_block(sb_bh, root_nid, &nblocks,
+					    packed_nid);
 	if (err)
 		goto exit;
 
@@ -761,6 +811,8 @@ exit:
 	erofs_cleanup_exclude_rules();
 	if (cfg.c_chunkbits)
 		erofs_blob_exit();
+	if (cfg.c_fragments)
+		erofs_fragments_exit();
 	erofs_exit_configure();
 
 	if (err) {
-- 
2.17.1



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